CN220064316U - Battery formation component capacity monitoring circuit - Google Patents
Battery formation component capacity monitoring circuit Download PDFInfo
- Publication number
- CN220064316U CN220064316U CN202321373667.7U CN202321373667U CN220064316U CN 220064316 U CN220064316 U CN 220064316U CN 202321373667 U CN202321373667 U CN 202321373667U CN 220064316 U CN220064316 U CN 220064316U
- Authority
- CN
- China
- Prior art keywords
- resistor
- operational amplifier
- pull
- electrically connected
- battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000012544 monitoring process Methods 0.000 title claims abstract description 47
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 20
- 238000005070 sampling Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000011149 active material Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The utility model discloses a battery formation component monitoring circuit, which comprises a sampling circuit, a first voltage source, a second pull-up resistor, a second voltage source and an operational amplifier, wherein the sampling circuit comprises a first connecting wire, a second connecting wire, a first pull-up resistor, a first voltage source, a second pull-up resistor and a second voltage source; one end of the first connecting wire is provided with a first signal acquisition end, and one end of the second connecting wire is provided with a second signal acquisition end; one end of the first pull-up resistor is electrically connected with the first voltage source, and the other end of the first pull-up resistor is electrically connected with the first signal acquisition end; one end of the second pull-up resistor is electrically connected with the second voltage source, and the other end of the second pull-up resistor is electrically connected with the second signal acquisition end; the operational amplifier is used for operating signals input by the first connecting wire and the second connecting wire so as to output monitoring voltage. Based on the monitoring circuit, the port voltage at two ends of the battery can be monitored, whether signal wires at two ends of the battery are normally connected can be effectively monitored, and therefore overcharge or overdischarge of the battery can be effectively avoided.
Description
Technical Field
The utility model relates to the technical field of battery state monitoring, in particular to a battery formation component monitoring circuit.
Background
As the demand of lithium batteries in the electric field increases greatly year by year, the yield of lithium batteries increases year by year, and the requirements of users on the quality of lithium batteries are also higher and higher. In the production process of the lithium battery, the formation, capacity division and detection system is the most critical link in the later process, and has great influence on the quality of the battery.
The formation component of the lithium battery cell is to initialize the battery in a charging and discharging mode, so that the active material of the cell is activated, and the process is an energy conversion process.
The formation is a charging process, but some battery cells need to be charged for more than several times, that is, after formation charging, the battery cells must be discharged, and the requirement on the process also leads to many battery manufacturers to directly use the charging and discharging machine with charging and discharging functions for formation. The meaning of capacity division is that qualified batteries are screened and grouped, and the consistency of the battery pack can be optimized by classifying batteries with different capacities.
In the battery formation and capacity division operation, it is necessary to detect the port voltage of the battery in real time to avoid overcharge/overdischarge. However, since the charge and discharge power supply is connected with the sampling line through the probe, and the probe is connected with the sampling line in a welding manner, thus, as the needle bed moves up and down for a long time, some welding points are easy to be connected loose due to infirm welding or aging, thereby causing loss or error of detection signals, leading to the situation that workers cannot find out overcharge/overdischarge in time, leading to damage of battery active substances, shortening of service life, and even causing explosion or ignition of the battery.
Therefore, improvements in the monitoring of the battery formation composition operation are needed to avoid overcharging/overdischarging.
Disclosure of Invention
The utility model aims to provide a battery formation component monitoring circuit which can effectively prevent overcharge/overdischarge in the formation component working of a battery.
In order to achieve the above object, the present utility model discloses a battery formation component monitoring circuit, which comprises a sampling circuit, wherein the sampling circuit comprises a first connecting wire, a second connecting wire, a first pull-up resistor, a first voltage source, a second pull-up resistor, a second voltage source and an operational amplifier, the first voltage source outputs a positive voltage signal, and the second voltage source outputs a negative voltage signal; one end of the first connecting wire is provided with a first signal acquisition end which is electrically connected with the anode of the battery to be monitored, and the other end of the first connecting wire is electrically connected with the in-phase input end of the operational amplifier; one end of the second connecting wire is provided with a second signal acquisition end which is electrically connected with the negative electrode of the battery to be monitored, and the other end of the second connecting wire is electrically connected with the inverting input end of the operational amplifier; one end of the first pull-up resistor is electrically connected with the first voltage source, and the other end of the first pull-up resistor is electrically connected with the first signal acquisition end on the first connecting line; one end of the second pull-up resistor is electrically connected with the second voltage source, and the other end of the second pull-up resistor is electrically connected with the second signal acquisition end on the second connecting line; the operational amplifier is used for operating the signals input by the first connecting wire and the second connecting wire so as to output monitoring voltage.
Preferably, the operational amplifier is a proportional operational amplifier.
Preferably, a feedback resistor is further disposed between the output end and the inverting input end of the operational amplifier.
Preferably, the resistance values of the first pull-up resistor and the second pull-up resistor are equal.
Preferably, the first connecting line is electrically connected with the same-direction input end of the operational amplifier through a first current limiting resistor, and the second connecting line is electrically connected with the opposite-direction input end of the operational amplifier through a second current limiting resistor.
Preferably, the unidirectional input end of the operational amplifier is further provided with a third pull-up resistor connected with the first current limiting resistor in parallel.
Preferably, the voltage output by the first voltage source is-5V, and the voltage output by the second voltage source is +5V.
Preferably, the output end of the operational amplifier is electrically connected with the controller through an A/D converter, and the monitoring circuit further comprises a display electrically connected with the controller.
Preferably, the system further comprises an alarm electrically connected with the controller.
Compared with the prior art, the monitoring circuit disclosed by the scheme comprises the sampling circuit, the sampling circuit calculates voltage signals acquired from the positive electrode and the negative electrode of the battery through the operational amplifier, so that the monitoring voltage at the two ends of the battery is output, and due to the arrangement of the first pull-up resistor, the first voltage source, the second pull-up resistor and the second voltage source, when the signal wires at the positive electrode or the negative electrode of the battery are in normal connection and abnormal connection, the monitoring voltage output by the operational amplifier is respectively in two different voltage ranges, so that according to the value of the monitoring voltage output by the operational amplifier, the port voltage at the two ends of the battery can be monitored, and whether the signal wires at the two ends of the battery are normally connected can be effectively monitored, thereby effectively avoiding the overcharge or overdischarge of the battery.
Drawings
Fig. 1 is a schematic diagram of a battery pack component monitoring circuit in accordance with one embodiment of the present utility model.
Fig. 2 is a schematic diagram of a battery pack component monitoring circuit in accordance with another embodiment of the present utility model.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present utility model in detail, the following description is made in connection with the embodiments and the accompanying drawings.
The embodiment discloses a battery formation component monitoring circuit, which is used for monitoring the port voltage of a target battery in a battery formation component process, and simultaneously monitoring whether the monitoring circuit is disconnected from the battery or not so as to avoid overcharge or overdischarge. Specifically, as shown in fig. 1, the monitoring circuit includes a sampling circuit, the sampling circuit includes a first connection line L1, a second connection line L2, a first pull-up resistor R1, a first voltage source VD1, a second pull-up resistor R2, a second voltage source VD2, and an operational amplifier U, the first voltage source VD1 outputs a positive voltage signal, and the second voltage source VD2 outputs a negative voltage signal.
One end of the first connecting wire L1 is provided with a first signal acquisition end D1 which is electrically connected with the anode of the battery to be monitored, and the other end of the first connecting wire L1 is electrically connected with the in-phase input end of the operational amplifier U.
One end of the second connecting wire L2 is provided with a second signal acquisition end D2 which is electrically connected with the negative electrode of the battery to be monitored, and the other end of the second connecting wire L2 is electrically connected with the inverting input end of the operational amplifier U.
One end of the first pull-up resistor R1 is electrically connected to the first voltage source VD1, and the other end of the first pull-up resistor R1 is electrically connected to the first signal collecting end D1 on the first connecting line L1.
One end of the second pull-up resistor R2 is electrically connected with the second voltage source VD2, and the other end of the second pull-up resistor R2 is electrically connected with the second signal acquisition end D2 on the second connecting line L2.
The operational amplifier U is used for operating the signals input by the first connection line L1 and the second connection line L2 to output the monitoring voltage.
In this embodiment, the sampling circuit calculates the voltage signals collected from the positive and negative poles of the battery through an operational amplifier U, so as to output the monitoring voltages at the two ends of the battery, and due to the arrangement of the first pull-up resistor R1, the first voltage source VD1, the second pull-up resistor R2 and the second voltage source VD2, when the signal lines at the positive or negative poles of the battery are in normal connection and abnormal connection, the monitoring voltages output by the operational amplifier U are respectively located in two different voltage ranges, so that according to the value of the monitoring voltages output by the operational amplifier U, not only the port voltages at the two ends of the battery can be monitored, but also whether the signal lines at the two ends of the battery are normally connected can be effectively monitored, thereby effectively avoiding the overcharge or overdischarge of the battery.
Further, the operational amplifier U is a proportional operational amplifier U, and can amplify or reduce the collected voltage signal.
Furthermore, a feedback resistor R6 is further disposed between the output terminal and the inverting input terminal of the operational amplifier U, and the resistance values of the first pull-up resistor R1 and the second pull-up resistor R2 are equal.
Further, the first connection line L1 is electrically connected to the co-directional input terminal of the operational amplifier U through the first current limiting resistor R3, and the second connection line L2 is electrically connected to the inverting input terminal of the operational amplifier U through the second current limiting resistor R4.
Still further, the unidirectional input terminal of the operational amplifier U is further provided with a third pull-up resistor R5 connected in parallel with the first current limiting resistor R3.
Specifically, the voltage output by the first voltage source VD1 is-5V, and the voltage output by the second voltage source VD2 is +5v.
In contrast, when the first signal acquisition end D1 and the second signal acquisition end D2 are normally connected with the positive electrode and the negative electrode of the battery, the monitoring voltage Vout output by the output end of the operational amplifier U is the port voltage of the battery.
When the first signal collecting terminal D1 is separated from the positive electrode of the battery and the second signal collecting terminal D2 is normally connected to the negative electrode of the battery, the monitoring voltage Vout output by the output terminal of the operational amplifier U satisfies the following formula one.
Equation one: vout= -5 [ (r6+r4) ×r5]/[ (r1+r3+r5) ×r4].
When the first signal collecting terminal D1 is normally connected to the positive electrode of the battery and the second signal collecting terminal D2 is separated from the negative electrode of the battery, the monitoring voltage Vout output from the output terminal of the operational amplifier U satisfies the following formula two.
Formula II: vout= -5×r5/(r1+r3+r5).
When the first signal collecting terminal D1 is separated from the positive electrode of the battery and the second signal collecting terminal D2 is also separated from the negative electrode of the battery, the monitoring voltage Vout output by the output terminal of the operational amplifier U satisfies the following formula three.
And (3) a formula III: vout= -5 [ r6 (r1+r3+r5) +r5 (r6+r2+r4) ]/[ (r2+r4) [ r1+r3+r5) ]
Therefore, no matter any one or both ends of the battery are separated from the signal acquisition line, the detection voltage output by the operational amplifier U is negative, and when the two ends of the battery are normally connected with the signal acquisition line, the detection voltage output by the operational amplifier U is positive or zero. The monitor voltages output by the operational amplifier U under different conditions were collected by the simulation program as shown in table 1 below.
TABLE 1
Therefore, when the detected voltage output by the operational amplifier U is negative, it indicates that the current signal acquisition line (i.e., the first connection line L1 and/or the second connection line L2) is separated from the battery, so that the worker can take countermeasures at the first time to avoid overcharge or overdischarge.
Further, as shown in fig. 2, the output end of the operational amplifier U is further electrically connected to the controller through an a/D converter, and the monitoring circuit further includes a display electrically connected to the controller. In this embodiment, through the arrangement of the a/D converter, the controller and the display, the monitoring voltage output by the operational amplifier U can be displayed in real time, so that the operator can check the monitoring voltage.
In addition, the monitoring circuit in the embodiment further comprises an alarm electrically connected with the controller. When the monitoring voltage output by the operational amplifier U is negative, the controller starts an alarm to remind a worker of timely coping with the operation.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (9)
1. The battery formation component monitoring circuit is characterized by comprising a sampling circuit, wherein the sampling circuit comprises a first connecting wire, a second connecting wire, a first pull-up resistor, a first voltage source, a second pull-up resistor, a second voltage source and an operational amplifier, wherein the first voltage source outputs a positive voltage signal, and the second voltage source outputs a negative voltage signal; one end of the first connecting wire is provided with a first signal acquisition end which is electrically connected with the anode of the battery to be monitored, and the other end of the first connecting wire is electrically connected with the in-phase input end of the operational amplifier; one end of the second connecting wire is provided with a second signal acquisition end which is electrically connected with the negative electrode of the battery to be monitored, and the other end of the second connecting wire is electrically connected with the inverting input end of the operational amplifier; one end of the first pull-up resistor is electrically connected with the first voltage source, and the other end of the first pull-up resistor is electrically connected with the first signal acquisition end on the first connecting line; one end of the second pull-up resistor is electrically connected with the second voltage source, and the other end of the second pull-up resistor is electrically connected with the second signal acquisition end on the second connecting line; the operational amplifier is used for operating the signals input by the first connecting wire and the second connecting wire so as to output monitoring voltage.
2. The battery cell composition monitoring circuit of claim 1, wherein the operational amplifier is a proportional operational amplifier.
3. The battery cell composition monitoring circuit of claim 2, wherein a feedback resistor is further disposed between the output and the inverting input of the operational amplifier.
4. The battery cell composition monitoring circuit of claim 3, wherein the first pull-up resistor and the second pull-up resistor have equal resistance values.
5. The battery formation component monitoring circuit of claim 3, wherein the first connection line is electrically connected to the co-directional input of the operational amplifier through a first current limiting resistor, and the second connection line is electrically connected to the inverting input of the operational amplifier through a second current limiting resistor.
6. The battery formation component monitoring circuit of claim 5, wherein the co-directional input of the operational amplifier is further provided with a third pull-up resistor in parallel with the first current limiting resistor.
7. The battery cell composition monitoring circuit of claim 1, wherein the voltage output by the first voltage source is-5V and the voltage output by the second voltage source is +5v.
8. The battery formation component monitoring circuit of claim 1, wherein the output of the operational amplifier is further electrically coupled to a controller via an a/D converter, the monitoring circuit further comprising a display electrically coupled to the controller.
9. The battery cell composition monitoring circuit of claim 8, further comprising an alarm electrically connected to the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321373667.7U CN220064316U (en) | 2023-05-31 | 2023-05-31 | Battery formation component capacity monitoring circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321373667.7U CN220064316U (en) | 2023-05-31 | 2023-05-31 | Battery formation component capacity monitoring circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220064316U true CN220064316U (en) | 2023-11-21 |
Family
ID=88766306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321373667.7U Active CN220064316U (en) | 2023-05-31 | 2023-05-31 | Battery formation component capacity monitoring circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220064316U (en) |
-
2023
- 2023-05-31 CN CN202321373667.7U patent/CN220064316U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100514744C (en) | Battery pack | |
| CN101752624A (en) | A kind of equalizing charge of battery method and device | |
| JP2006344611A (en) | Battery pack | |
| CN111600353A (en) | Lithium battery protection control ASIC chip system | |
| CN201629586U (en) | Battery equalizing charge device | |
| CN103645442A (en) | Detection apparatus for surplus capacity of electric locomotive storage battery | |
| CN110336357A (en) | A kind of novel lithium battery protection board | |
| CN201426046Y (en) | Power management system for car high power lithium battery stack with balancing function | |
| CN102820486A (en) | Lithium iron phosphate battery module with heavy load discharge technology | |
| CN220064316U (en) | Battery formation component capacity monitoring circuit | |
| CN205195249U (en) | Digit BMS protection shield with data storage function | |
| CN116846034A (en) | Positive and negative pole loop control system between battery and connector | |
| CN201609889U (en) | Combination of electric tool and battery pack | |
| CN203606472U (en) | Detection device of electric locomotive storage battery residual capacity | |
| CN113258637A (en) | Control system of high-performance pulse type charger | |
| CN207835122U (en) | A kind of charge and discharge control plate of lithium-sulfur cell | |
| CN202159997U (en) | Lithium battery system | |
| CN111060843A (en) | Device and method for detecting leakage current of slave board of battery management system | |
| CN211265651U (en) | Protection BMS with lithium battery replacing lead-acid battery | |
| CN214380150U (en) | Battery safety shunt circuit, battery and electronic equipment | |
| CN217034189U (en) | Hydrogen fuel cell analog circuit | |
| CN215772621U (en) | Lithium battery protection device integrated on mainboard | |
| CN202855862U (en) | Lithium iron phosphate battery pack module of large-current discharge technology | |
| CN213585208U (en) | Charging-discharging and display control circuit of lithium ion battery | |
| CN220340365U (en) | Charging and discharging detection tool |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |